﻿// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// Copyright (c) 2011, Dr. Masroor Ehsan
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the author nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// $Author:$
// $Id:$
// $Rev:$
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

using System;
using System.Collections.Generic;

namespace MaxTrader.HttpTransport.Core
{
    public static class SpoofedUserAgentGenerator
    {
        private static readonly Random _rand = new Random(Environment.TickCount);

        private static readonly List<string> _languages = new List<string> {"en-AU", "en-GB", "en-CA", "en-NZ", "en-US"};

        private static readonly List<string> _os = new List<string>
                                                       {
                                                           "Windows NT 5.1",
                                                           "Windows NT 6.1",
                                                           "Windows NT 7.1",
                                                           "Mac OS X",
                                                           "Linux",
                                                           "FreeBSD"
                                                       };

        private static readonly List<string> _arch = new List<string> {"i386", "amd64", "alpha", "sparc64", "WOW64"};

        private static string GenerateReleaseDate()
        {
            var yr = _rand.Next(2003, DateTime.UtcNow.Year - 1);
            var mo = _rand.Next(1, 12);
            var dy = _rand.Next(1, 27);
            return string.Format(@"{0:00}{1:00}{2:00}", yr, mo, dy);
        }

        private static string GenerateFirefoxAgent()
        {
            var lang = _languages[_rand.Next(0, _languages.Count)];
            var os = _os[_rand.Next(0, _os.Count)];
            var arch = _arch[_rand.Next(0, _arch.Count)];
            return string.Format(@"Mozilla/5.0 ({0}; U; {1}; {2}) Gecko/{3} Firefox/5.0", os, arch, lang,
                                 GenerateReleaseDate());
        }

        private static string GenerateInternetExplorerAgent()
        {
            var lang = _languages[_rand.Next(0, _languages.Count)];
            var os = _os[_rand.Next(0, _os.Count)];
            var arch = _arch[_rand.Next(0, _arch.Count)];
            var ver = _rand.Next(5, 10);
            return string.Format(@"Mozilla/5.0 (compatible; MSIE {0}.0; {1}; {2}; {3}; Trident/6.0)", ver, os, arch,
                                 lang);
        }

        private static string GenerateChromeAgent()
        {
            var os = _os[_rand.Next(0, _os.Count)];
            var ver = _rand.Next(5, 15);
            var safari = _rand.Next(525, 535);
            return
                string.Format(
                    @"Mozilla/5.0 ({0}) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/{1}.0.872.0 Safari/{2}.2", os, ver,
                    safari);
        }

        public static string Next()
        {
            switch (_rand.Next(1, 3))
            {
                case 1:
                    return GenerateInternetExplorerAgent();
                case 2:
                    return GenerateChromeAgent();
                default:
                    return GenerateFirefoxAgent();
            }
        }
    }
}